Hierarchically porous carbons with graphene incorporation for efficient supercapacitors

摘要: Abstract Simultaneous improvement in capacitance, rate capability and cycleability of electrode material is highly desired for high-performance supercapacitor, which necessitates the rational design pore texture surface composition materials. Herein, graphene incorporated activated carbon synthesized by pyrolysis alkali activation oxide-egg white (EW) precursor. The 3-dimensionally intertwined mat induces coating EW constructs hierarchical porosity resultant carbon. Benefit from interconnected large mesopores/macropores channels deriving robust conductive mat, abundant micropores/small mesopores with slightly enlarged width treatment, as well essential pseudocapacitance stemming N, O functionalities, high electrons/ions conductivities considerable capacitance can be ensured. As a result, dramatically enhanced overall offered under higher current densities consecutive charging-discharging cycles. sample prepared incorporation treatment precursor, labeled AGEWC, delivers specific 291 F g−1 at 1 A g−1 1 M H2SO4 electrolyte, improved (69% maintaining ratio within 0.5∼15 A g−1) (90% retention after 5000 charge-discharge cycles). present work provides low cost while efficient strategy to comprehensively optimize capacitive performances based supercapacitors.